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Inventory Change in Inventory (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of inventories [Abstract] |  |
Inventories at the beginning of the period | $ 251 | $ 242
Net addition |  | 12
Change in foreign exchange rates | (2) | (3)
Writedowns | 37 |
Net addition | 26 |
Inventories at the end of the period | $ 238 | $ 251

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